JP2009201984A - Surgical treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surgical treatment apparatus for treating living tissue, capable of being appropriately operated. <P>SOLUTION: In a second unit 22 of the surgical treatment apparatus, an elastic member 67 is disposed between a second vibration transmitting member 61 and a second holder member 54. The elastic member 67 is deformed according to the relative disposition of the second vibration transmitting member 61 to the second holder member 54 in the axial direction to apply elastic force in the axial direction to the second vibration transmitting member 61. Regulating connection mechanisms 69 and 74 of the surgical treatment apparatus connect a first unit 21 to the second unit 22 to coaxially dispose a first vibration transmitting member 31 of the first unit 21 and the second vibration transmitting member 61 of the second unit 22. The quantity of deformation of the elastic member 67 is regulated by making an end of the first vibration transmitting member 31 and an end of the second vibration transmitting member 61 abut to each other and regulating the relative disposition of a first holder member 39 to the second holder member 54 in the coaxial direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a surgical treatment apparatus for treating living tissue.

  Patent Document 1 discloses an ultrasonic treatment apparatus as a surgical treatment apparatus. In the ultrasonic treatment apparatus, a surgical instrument is detachable from the handpiece assembly. A horn that magnifies and transmits ultrasonic vibrations is inserted through the handpiece assembly. A transmission rod for transmitting ultrasonic vibration is inserted through the cylindrical housing of the surgical instrument. The front end of the housing has a narrow inner diameter and a stepped surface. The transmission rod has a flange. An elastic member is interposed between the stepped surface and the flange. By connecting the distal end portion of the handpiece assembly and the proximal end portion of the surgical instrument, the distal end portion of the horn of the handpiece assembly and the proximal end portion of the transmission rod of the surgical instrument are pressed and connected to each other. As a method of connecting the handpiece and the surgical instrument, screwing is employed, and other examples include snap-on coupling and torsion lock fit.

European Patent No. 893971

  In the ultrasonic treatment apparatus such as Patent Document 1, in order for the ultrasonic treatment apparatus to be appropriately operated, the amount of pressing force acting between the distal end portion of the horn and the proximal end portion of the transmission rod is appropriately constant. Must be within range. However, Patent Document 1 does not disclose any specific configuration for adjusting the amount of pressing force.

  The present invention has been made paying attention to the above problems, and an object of the present invention is to provide a surgical apparatus that can be appropriately operated.

  In a first embodiment of the present invention, a surgical treatment apparatus holds a first vibration transmission member that extends in the axial direction and has an end to transmit ultrasonic vibrations, and the first vibration transmission member. A first unit having a first holding member; a second vibration transmission member having an end portion extending in the axial direction and transmitting ultrasonic vibration; and being movable in the axial direction of the second vibration transmission member A second holding member holding the second vibration transmitting member; and a shaft of the second vibration transmitting member provided between the second vibration transmitting member and the second holding member. The second vibration transmission member is deformed according to the relative arrangement of the second vibration transmission member and the second holding member with respect to the direction, and the second vibration transmission member has an elastic force in the axial direction of the second vibration transmission member A second unit having an elastic member for providing the first unit, and the second unit. Are connected to each other, and the first vibration transmission member and the second vibration transmission member are arranged coaxially, so that the end of the first vibration transmission member and the second vibration transmission member The amount of deformation of the elastic member is adjusted to be constant by bringing the end portions into contact with each other and adjusting the relative arrangement of the first holding member and the second holding member in the coaxial direction to be constant. And an adjusting connection mechanism.

  In a second embodiment of the present invention, in the surgical treatment apparatus, the adjustment coupling mechanism has a cam mechanism, and the cam mechanism is one of the first holding member and the second holding member. An operation portion provided in a holding member; an operation receiving portion provided in the other holding member of the first holding member and the second holding member and extending in a spiral shape around an axis; The operating unit is moved along the operating receiving unit, and the first unit and the second unit are connected to each other when the operating unit is disposed at a connecting position of the operating receiving unit. It is characterized by that.

  In a third embodiment of the present invention, in the surgical treatment apparatus, the adjustment connecting mechanism causes the first holding member and the second holding member to move relative to each other in a coaxial direction against the elastic force of the elastic member. As for the operation for moving, the relative movement amount of the first holding member and the second holding member in the coaxial direction with respect to the operation amount is shared so that the required operation force amount is constant. The first holding member and the second holding member in the axial direction are changed according to the relative arrangement of the first holding member and the second holding member.

  In a fourth embodiment of the present invention, in the surgical treatment apparatus, the cam mechanism relatively moves the first holding member and the second holding member in the coaxial direction against the elastic force of the elastic member. As for the rotation operation for moving the rotation angle, the pressure angle is changed with respect to the rotation angle so that the amount of rotation operation force is constant.

  In a fifth embodiment of the present invention, the surgical treatment apparatus is characterized in that the adjustment coupling mechanism has a notification mechanism for notifying that the first unit and the second unit are coupled. .

  In a sixth embodiment of the present invention, in the surgical treatment apparatus, the cam mechanism has an uneven shape that protrudes and projects in a direction intersecting the operation receiving portion before the connection position in the operation receiving portion. Features.

  In a seventh embodiment of the present invention, in the surgical treatment apparatus, the adjustment connecting mechanism can connect the first unit and the second unit in a plurality of relative rotational arrangements around a coaxial axis. It is characterized by that.

  In an eighth embodiment of the present invention, the surgical treatment apparatus is characterized in that the cam mechanism has first and second coupling positions arranged at positions different from each other in the circumferential direction.

  In a ninth embodiment of the present invention, in the surgical treatment apparatus, the second vibration transmission member includes a thick outer diameter portion formed on one end side in the axial direction of the second vibration transmission member, and the second A thin outer diameter portion that is formed on the other end side in the axial direction of the vibration transmission member and has a smaller outer diameter than the thick outer diameter portion, and the thick outer diameter portion and the thin outer diameter portion in the second vibration transmission member. And a taper portion having an outer diameter decreasing from one end side to the other end side in the axial direction, and a pressing portion provided in the taper portion or the thin outer diameter portion and projecting in the radial direction. And the said elastic member is provided between the said press part and the said 2nd holding member about the axial direction, It is characterized by the above-mentioned.

  In the surgical treatment apparatus according to the first embodiment of the present invention, when the first unit and the second unit are connected, the deformation amount of the elastic member is adjusted to be constant, so that the elastic member changes to the second vibration transmitting member. The amount of elastic force applied is adjusted to be constant, and the amount of pressing force acting between the first vibration transmission member and the second vibration transmission member is adjusted to be constant. For this reason, it is possible to operate the first and second vibration transmitting members appropriately.

  In the surgical treatment apparatus according to the second embodiment of the present invention, the first holding member and the second holding member are relatively rotated around the coaxial axis, and the operating portion is moved along the operating receiving portion to be connected. By arranging at the position, the relative arrangement of the first holding member and the second holding member in the coaxial direction is adjusted to be constant, and the deformation amount of the elastic member is adjusted to be constant.

  In the surgical treatment apparatus according to the third embodiment of the present invention, the connection force between the first holding member and the second holding member is such that the amount of operation force is constant regardless of the amount of deformation of the elastic member. Can be performed smoothly.

  In the surgical treatment apparatus according to the fourth embodiment of the present invention, the amount of rotational operation force is made constant regardless of the amount of deformation of the elastic member by changing the pressure angle with respect to the rotational angle in the cam mechanism.

  In the surgical treatment apparatus according to the fifth embodiment of the present invention, the fact that the first unit and the second unit are connected is notified, and the connection between the first unit and the second unit is recognized. It is possible to do.

  In the surgical treatment apparatus according to the sixth embodiment of the present invention, a click feeling is generated when the operating part passes through the uneven shape in front of the connection position, and the connection between the first unit and the second unit is caused by this click feeling. I am trying to announce.

  In the surgical treatment apparatus according to the seventh embodiment of the present invention, the first unit and the second unit may be coupled in a desired relative rotational arrangement out of a plurality of relative rotational arrangements around the coaxial axis. The surgical apparatus can be configured to be suitable for the current procedure.

  In the surgical treatment apparatus according to the eighth embodiment of the present invention, the operating unit can be disposed at the first and second coupling positions that are disposed at different positions in the circumferential direction, whereby the first unit and the second unit are arranged. These units can be connected in a plurality of relative rotational arrangements around a coaxial axis.

  In the surgical treatment apparatus according to the ninth embodiment of the present invention, the second vibration transmission member is formed with a tapered portion and a thin outer diameter portion that are thinner than the thick outer diameter portion, and the pressing portion protruding in the radial direction is tapered. Therefore, the second unit is prevented from becoming thicker and the operability of the surgical treatment apparatus is prevented from being lowered.

The side view which shows the surgical treatment tool of one Embodiment of this invention. The longitudinal cross-sectional view which shows the surgical treatment tool of one Embodiment of this invention. The longitudinal cross-sectional view which shows the cam frame of one Embodiment of this invention. The expanded view which shows the cam frame of one Embodiment of this invention. The figure which shows the graph of the relationship between the crushing amount of the elastic member of one Embodiment of this invention, and pressing force amount. The figure which shows the graph of the relationship between the rotation angle of the cam mechanism of one Embodiment of this invention, and a pressure angle. The fragmentary longitudinal cross-section side view which shows the surgical treatment tool of the 1st modification of one Embodiment of this invention. The side view which shows the surgical treatment tool of the 2nd modification of one Embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  1 to 5B show an embodiment of the present invention.

  The surgical treatment tool as the surgical treatment apparatus of this embodiment is an ultrasonic output combined high-frequency treatment tool for laparotomy.

  A schematic configuration of the surgical instrument will be described with reference to FIGS. 1 and 2.

  The surgical instrument has a handpiece 21 as a first unit held and operated by an operator. The handpiece 21 extends in the axial direction. An electric cable 23 extends from the proximal end portion of the handpiece 21, and the electric cable 23 is connected to the apparatus main body.

  A vibrator 24 is accommodated in the handpiece 21, and the vibrator 24 extends in the axial direction of the handpiece 21. A piezoelectric element portion 26 that generates ultrasonic vibration is disposed at the proximal end portion of the vibrator 24, and a first vibration transmission member that expands and transmits the ultrasonic vibration to the distal end side of the vibrator 24. The horn 31 is provided. Here, the tip of an ultrasonic cable 33 is connected to the piezoelectric element portion 26, and the ultrasonic cable 33 is introduced into the electric cable 23. When a drive current is supplied from the apparatus main body to the piezoelectric element portion 26 via the ultrasonic cable 33, electrical vibration is converted into mechanical vibration in the piezoelectric element portion 26, and the vibrator 24 is ultrasonically vibrated. Here, the axial length of the vibrator 24 is the length of one wavelength of ultrasonic vibration, the axial length of the piezoelectric element portion 26 is the length of a quarter wavelength of ultrasonic vibration, and the horn 31. The axial length of is the length of 3/4 wavelength of ultrasonic vibration. And the base end of the horn 31 becomes a node position of ultrasonic vibration, and a flange-shaped fixing portion 34 is formed. The tip of the horn 31 is the antinode position of ultrasonic vibration. On the other hand, the distal end portion of the high-frequency cable 38 is connected to the piezoelectric element portion 26. The high frequency cable 38 is introduced into the electric cable 23. By supplying a high-frequency current from the apparatus main body to the piezoelectric element portion 26 via the high-frequency cable 38, the high-frequency current is passed through the vibrator 24.

  The vibrator 24 is accommodated in an inner housing 39 as a first holding member. The inner housing 39 extends in the axial direction and is formed by a proximal end inner cylinder 41 and a distal end side inner cylinder 42. The proximal end inner cylinder 41 accommodates the piezoelectric element portion 26, and the distal end inner cylinder 42 accommodates the horn 31. A protrusion 43 extends in the circumferential direction on the inner peripheral surface of the distal end side inner cylinder 41. The proximal end portion of the distal end side inner cylinder 42 is inserted into the distal end portion of the proximal end side inner cylinder 41 and screwed. By screwing the distal end side inner cylinder 42 into the proximal end side inner cylinder 41, the fixing portion 34 of the vibrator 24 is sandwiched between the protruding portion 43 of the proximal end side inner cylinder 41 and the proximal end surface of the distal end side inner cylinder 42. It has been fixed. An annular fixing spacer 44 for adjusting the fixing position of the vibrator 24 in the axial direction is interposed between the distal end surface of the fixing portion 34 and the proximal end surface of the distal end inner cylinder 42.

  The inner housing 39 is accommodated in the outer housing 47. A hand switch portion 49 is disposed in the outer housing 47. The hand switch unit 49 is provided with an incision output switch 52a, a coagulation output switch 52b, and a simultaneous output switch 52c. A switch cable 53 extends from the switch body 51 of the hand switch unit 49, and the switch cable 53 is introduced into the electric cable 23. By depressing the incision output switch 52a, an incision current for high frequency incision treatment is output from the apparatus main body to the piezoelectric element portion 26, and the surgical instrument is driven in the incision output mode. By depressing the coagulation output switch 52b, a coagulation current for high-frequency coagulation treatment is output, and the surgical instrument is driven in the coagulation output mode. By depressing the simultaneous output switch 52c, a high-frequency current for high-frequency treatment and a drive current for ultrasonic treatment are simultaneously output, and the surgical instrument is driven in the simultaneous output mode.

  The surgical instrument has a sheath unit 22 as a second unit for treating living tissue. In the sheath unit 22, a probe 61 as a second vibration transmission member is inserted through a cylindrical sheath assembly 54 as a second holding member.

  The sheath assembly 54 is formed by a distal end side sheath 55 and a proximal end side sheath 56. In the distal end side sheath 55, a small inner diameter portion 57, a medium inner diameter portion 58, and a large inner diameter portion 59 are formed in this order from the distal end side to the proximal end side. The distal end portion of the proximal end side sheath 56 is inserted and screwed into the large inner diameter portion 59 of the distal end side sheath 55. A rotation dial 60 for rotating the sheath unit 22 with respect to the handpiece 21 is formed at an axially intermediate portion of the proximal end side sheath 56.

  On the other hand, in the probe 61, a treatment portion 62, a thin outer diameter portion 63, a taper portion 64, and a thick outer diameter portion 66 are formed in this order from the distal end side to the proximal end side. The treatment section 62 is for treating a living tissue and has a non-rotationally symmetric hook shape. The tapered portion 64 has an outer diameter that increases from the distal end side to the proximal end side, and a flange-shaped pressing portion 65 is formed on the tapered portion 64. Here, the length of the probe 61 in the axial direction is ½ wavelength of the ultrasonic vibration, the tip and the base end of the probe 61 are the antinode positions of the ultrasonic vibration, and the pressing portion 65 is super It is the node position of sonic vibration. Note that the outer diameter of the pressing portion 65 of the probe 61 is equal to or smaller than the outer diameter of the thick outer diameter portion 66.

  A pressing portion 65 of the probe 61 is inserted into the inner diameter portion 58 of the distal end side sheath 55 of the sheath unit 22 so as to be slidable in the axial direction and not rotatable about the central axis of the probe 61. That is, the probe 61 is movable in the axial direction with respect to the sheath assembly 54 and is not rotatable about the central axis of the probe 61. A support surface 70 is formed by a step surface between the small inner diameter portion 57 and the inner inner diameter portion 58 of the distal sheath 55. Between the support surface 70 of the distal sheath 55 and the distal surface of the pressing portion 65 of the probe 61, an annular elastic member 67 is disposed on the distal end side, and an annular pressing spacer 68 is disposed on the proximal end side. . The pressing spacer 68 is for adjusting the crushing amount of the elastic member 67. The proximal end surface of the pressing portion 65 of the probe 61 is supported by the distal end surface of the proximal end side sheath 56 that is screwed to the large inner diameter portion 59 of the distal end side sheath 55. In other words, the elastic member 67 is configured such that the probe 61 is movable in the axial direction with respect to the sheath assembly 54 by the support surface 70 of the distal sheath 55 and the distal surface of the proximal sheath 56 of the sheath assembly 54. The pressing spacer 68 and the pressing portion 65 of the probe 61 are sandwiched in the axial direction.

  A cam mechanism for detachably connecting the sheath unit 22 and the handpiece 21 to each other will be described with reference to FIGS. Here, the sheath unit 22 and the handpiece 21 are connected to each other coaxially, and hereinafter, one direction in the circumferential direction of the coaxial is referred to as a connecting direction and the other direction is referred to as a separating direction.

  In the sheath unit 22, a cam pin 69 serving as an operating portion projects from the proximal end portion of the proximal end side sheath 56 outward in the radial direction. On the other hand, in the handpiece 21, the proximal end portion of the connecting tube 71 is connected to the distal end portion of the distal end side inner tube 42 of the inner housing 39 coaxially. A cam frame 72 is inserted and fixed on the distal end side of the connecting cylinder 71. A cam receiving portion 73 that protrudes inward in the radial direction is formed on the inner peripheral surface on the distal end side of the cam frame 72. Of the side surfaces of the cam receiving portion 73, a cam surface 74 as an operation receiving portion is formed by a side surface that is disposed in the separation direction side and toward the proximal end as a whole. The cam surface 74 forms an introduction surface 75, an operation surface 76, and a connection surface 77 from the distal end side to the proximal end side. The introduction surface 75 extends in the axial direction, the operating surface 76 is generally oriented in the separating direction and toward the proximal end, and extends spirally around the central axis of the cam frame 72, and the connecting surface 77 is directed toward the proximal end. However, it extends in the circumferential direction. Further, a connecting convex surface 78 protruding toward the base end is formed at the end portion in the separation direction of the connecting surface 77, and a rotating convex surface 79 protruding toward the base end is formed at the end portion of the connecting surface 77 in the connecting direction. Has been. An engagement concave surface 80 is formed between the connection convex surface 78 and the rotation convex surface 79 as a connection position where the cam pin 69 is engaged. Four cam receiving portions 73 are arranged at equal intervals in the circumferential direction. Among the side surfaces of the cam receiving portion 73, the cam pins 69 extending along the cam surface 74 of the cam receiving portion 73 adjacent to the connecting direction side of the cam receiving portion 73 as a whole are arranged in the connecting direction side and toward the distal end. The introduction groove portion 82 is formed between the adjacent cam receiving portions 73. It should be noted that a pair of guide surfaces 83 that extend in the circumferential direction toward the distal end side and guide the cam pins 69 are formed at the distal end portions on both side surfaces of the introduction groove portion 82.

  By positioning the cam pin 69 of the sheath unit 22 in the introduction groove portion 82 of the cam frame 72 of the handpiece 21 and inserting the proximal end portion of the sheath unit 22 into the distal end portion of the handpiece 21 in the axial direction, the cam pin 69 is It is moved in the axial direction along the introduction groove 82 of the cam frame 72. Here, the probe 61 held by the sheath unit 22 is disposed coaxially with the horn 31 fixed to the handpiece 21, and the proximal end surface of the probe 61 is brought into contact with the distal end surface of the horn 31. By rotating the sheath unit 22 in the connecting direction with respect to the handpiece 21, the cam pin 69 moves along the operating surface 76 of the cam surface 74, and the sheath assembly 54 of the sheath unit 22 is moved to the handpiece 21. On the other hand, it is moved toward the proximal end. Here, since the proximal end surface of the probe 61 of the sheath unit 22 is in contact with the distal end surface of the horn 31 of the handpiece 21, the probe 61 cannot move toward the proximal end with respect to the horn 31. Accordingly, in the sheath unit 22, the sheath assembly 54 is moved to the proximal end side with respect to the probe 61, and the elastic member 67 interposed between the probe 61 and the sheath assembly 54 is pivoted. Crushed in the direction. The elastic member 67 is crushed in the axial direction, thereby applying a pressing force toward the distal end to the sheath assembly 54 and applying a pressing force toward the proximal end to the probe 61. The cam pin 69 of the sheath assembly 54 is pressed against the cam surface 74 disposed on the distal end side by the pressing force toward the distal end of the sheath assembly 54. On the other hand, a pressing force acts on the probe 61 between the proximal end surface of the probe 61 and the distal end surface of the horn 31 due to the pressing force toward the proximal end. Further, by rotating the sheath unit 22 in the connecting direction with respect to the handpiece 21, the cam pin 69 gets over the connecting convex surface 78 of the cam surface 74 and is engaged with the engaging concave surface 80, and the sheath unit 22 and the handpiece are engaged. 21 is connected. When the cam pin 69 gets over the connecting convex surface 78 of the cam surface 74 and is engaged with the engaging concave surface 80, a click feeling such as a clicking sound is generated, and it is recognized that the sheath unit 22 and the handpiece 21 are connected. Is possible. When the sheath unit 22 and the handpiece 21 are separated, the sheath unit 22 is rotated with respect to the handpiece 21 in the separation direction.

  Here, the amount of pressing force acting between the base end surface of the probe 61 and the tip end surface of the horn 31 corresponds to the amount of pressing force applied from the elastic member 67 to the probe 61, and the amount of pressing force of the elastic member 67 is that of the elastic member 67. The amount of collapse of the elastic member 67 is determined by the relative position in the axial direction of the sheath assembly 54 with respect to the probe 61. Further, the relative position in the axial direction of the sheath assembly 54 with respect to the probe 61 is determined by the relative position in the axial direction of the sheath assembly 54 with respect to the horn 31, and in the handpiece 21, the horn 31, the inner housing 39, and the connecting cylinder 71 are integrated. Therefore, the relative position in the axial direction of the sheath assembly 54 with respect to the horn 31 is determined by the relative position in the axial direction of the sheath assembly 54 with respect to the connecting tube 71. That is, the amount of pressing force acting between the proximal end surface of the probe 61 and the distal end surface of the horn 31 is determined by the relative position in the axial direction of the sheath assembly 54 with respect to the connecting tube 71. In the case where the sheath unit 22 is coupled to the handpiece 21, the relative position in the axial direction of the sheath assembly 54 with respect to the coupling cylinder 71 is the axial position of the coupling surface 77 of the cam surface 74, that is, the engagement of the cam surface 74. By setting the axial position of the bottom surface of the concavity 80 as appropriate, it can be determined very accurately. Therefore, the amount of pressing force acting between the base end surface of the probe 61 and the front end surface of the horn 31 can be determined very accurately.

Further, the amount of rotational operation force required to rotate the sheath unit 22 in the connecting direction relative to the handpiece 21 against the amount of pressing force of the elastic member 67 is constant. That is, as shown in FIG. 5A, the pressing force P _l of the elastic member 67 is increased relative to the increase in the crush amount x of the elastic member 67. The value obtained by multiplying the pressing force P _l of the elastic member 67 in the axial direction of the movement amount δl of the sheath assembly 54 relative to the coupling tube 71, corresponding to a value obtained by multiplying the rotation operation force amount P _theta in rotation angle δθ of the cam mechanism It will be. That is, P _l (x) * δl∝P _θ * δθ. Here, when the pressure angle α of the operating surface 76 of the cam surface 74 is constant with respect to the rotation angle θ of the cam mechanism, the axial movement amount δl of the sheath assembly 54 with respect to the rotation angle amount δθ of the cam mechanism, That is, δl / δθ is constant. In this case, as the rotation angle θ of the cam mechanism increases, the amount x of collapse of the elastic member 67 increases, and as the pressing force amount P _l (x) increases, the necessary rotational operation force amount P _θ ∝P _l (x ) * (Δl / δθ) will be increased. On the other hand, in this embodiment, as shown in FIG. 5B, the pressure angle α of the operating surface 76 of the cam surface 74 is appropriately increased with respect to the increase of the rotation angle θ of the cam mechanism, and the rotation angle of the cam mechanism By appropriately reducing the axial movement amount δl of the sheath assembly 54 with respect to the amount δθ, that is, δl / δθ, the rotational operation force amount P _θ ∝P _l (x) * (δl / δθ) is made constant.

  In the cam mechanism, four engagement concave surfaces 80 as connection positions with which the cam pins 69 are engaged are arranged at equal intervals in the circumferential direction, and the sheath unit 22 is arranged in four relative rotational arrangements with respect to the handpiece 21. Can be linked. When the proximal end portion of the sheath unit 22 is inserted into the distal end portion of the handpiece 21 in the axial direction, the introduction groove portion 82 into which the cam pin 69 is inserted is selected from the four introduction groove portions 82, thereby The relative rotational arrangement of the sheath unit 22 can be selected from among four relative rotational arrangements. Further, when the sheath unit 22 is connected to the handpiece 21, the cam pin 69 gets over the rotating convex surface 79 from the engaging concave surface 80 by rotating the sheath unit 22 in the connecting direction with respect to the handpiece 21. Moved. Since the cam pin 69 is pressed toward the distal end by the action of the elastic member 67, the cam pin 69 is detached from the cam surface 74 that has been pressed so far and moved toward the distal end, and the connecting direction of the cam receiving portion 73. Transition is made to the cam surface 74 of the cam receiving portion 73 adjacent to the side. When the sheath unit 22 is further rotated in the connecting direction with respect to the handpiece 21, the cam pin 69 is moved along the shifted cam surface 74 and is again engaged with the engaging concave surface 80. The sheath unit 22 is coupled to the above. As described above, when the sheath unit 22 is coupled to the handpiece 21, the sheath unit 22 is rotated with respect to the handpiece 21 by rotating the sheath unit 22 in the coupling direction with respect to the handpiece 21. It is possible to move between two relative rotational arrangements. Therefore, the treatment portion 62 of the probe 61 can be arranged in an arbitrary direction with respect to the hand switch portion 49 of the handpiece 21.

  Accordingly, the surgical instrument according to this embodiment has the following effects.

  In the surgical instrument of the present embodiment, when the handpiece 21 and the sheath unit 22 are connected, the elastic force applied from the elastic member 67 to the probe 61 is made constant by adjusting the deformation amount of the elastic member 67 to be constant. The amount of pressing force acting between the horn 31 and the probe 61 is adjusted to be constant. In particular, by using a cam mechanism for connecting the handpiece 21 and the sheath unit 22, the amount of pressing force can be adjusted very accurately. Here, when the amount of pressing force is smaller than the appropriate range, ultrasonic vibration cannot be normally transmitted from the horn 31 to the probe 61. On the other hand, when the amount of pressing force is larger than the appropriate range, the mechanical impedance increases, the resistance of the vibrator 24 increases, and the vibration efficiency decreases. Further, the amount of rotational operation force required to rotate the sheath unit 22 with respect to the handpiece 21 against the amount of pressing force of the elastic member 67 becomes large, and the rotation operation becomes difficult. In this embodiment, since the amount of pressing force is adjusted within an appropriate range, the horn 31 and the probe 61 can be appropriately ultrasonically vibrated, and the rotation operation is facilitated.

  Further, by changing the pressure angle with respect to the rotation angle in the cam mechanism, in the rotation operation to the handpiece 21 and the sheath unit 22, the rotation operation force is made constant regardless of the deformation amount of the elastic member 67. Yes. For this reason, it is possible to perform a rotation operation smoothly.

  Further, since the cam pin 69 is engaged with the engaging concave surface 80 beyond the connecting convex surface 78 and a click feeling is generated when the cam pin 69 is engaged with the engaging concave surface 80, the sheath unit 22 is attached to the handpiece 21. Can be recognized.

  In addition, the cam pin 69 can be engaged with a desired engagement concave surface 80 among the four engagement concave surfaces 80 that are arranged at positions different from each other in the circumferential direction. It is possible to connect the sheath unit 22 to the handpiece 21 with the relative rotational arrangement. For this reason, it is possible to make the surgical treatment instrument into a form suitable for the current treatment. In particular, the way of holding the handpiece 21 is appropriately determined according to the arrangement of the hand switch 49 in the handpiece 21, and when the treatment section 62 of the probe 61 has a non-rotation symmetric shape as in the present embodiment, If the sheath unit 22 cannot rotate with respect to the piece 21 and the orientation of the treatment portion 62 cannot be changed, the surgical instrument becomes difficult to use, but this situation is prevented in this embodiment.

  Furthermore, the probe 61 is formed with a taper portion 64 and a thin outer diameter portion 63 that are thinner than the thick outer diameter portion 66, and a flange-like pressing portion 65 is formed on the taper portion 64. The diameter is equal to or smaller than the outer diameter of the thick outer diameter portion 66. That is, the diameter of the sheath unit 22 is avoided and the operability of the surgical instrument is prevented from being lowered. In particular, in a surgical instrument for relatively short laparotomy as in the present embodiment, due to the increase in diameter of the surgical instrument, it becomes difficult to visually recognize the treatment part 62 at the distal end of the surgical instrument. However, in this embodiment, such a situation is prevented.

  In this embodiment, the treatment portion having a non-rotationally symmetric shape is used. However, the present invention can also be applied to a treatment portion having a rotationally symmetric shape, for example, the tip of the probe is spherical. .

  The present invention can also be applied to various surgical treatment apparatuses other than the above-described ultrasonic output combined high-frequency treatment instrument for laparotomy.

  For example, the present invention is also applicable to an ultrasonic output combined high-frequency treatment instrument for endoscopic surgery as shown in FIG. In the surgical instrument shown in FIG. 6, the handpiece 21 and the sheath unit 22 having the same configuration as those of the above-described embodiment are used. However, the sheath unit 22 is long, and the proximal end portion of the insertion sheath 86 is inserted and fixed at the distal end portion of the distal end side sheath 55, and the probe 61 is inserted through the insertion sheath 86. The axial length of the probe 61 is an integral multiple of 1/2 wavelength of ultrasonic vibration.

  Further, for example, the present invention can be applied to an ultrasonic treatment instrument for endoscopic surgery as shown in FIG. In the surgical instrument shown in FIG. 7, the probe 61 is inserted through the insertion sheath 86 of the sheath unit 22. A jaw 92 is pivotally attached to the distal end portion of the insertion sheath 86, and the jaw 92 can be opened and closed with respect to the treatment portion 62 at the distal end portion of the probe 61, and can grasp a living tissue in cooperation with the probe 61. The proximal end portion of the sheath unit 22 is connected to the distal end side of the handle unit 88. A pair of handles 91 project from the cylindrical main body 89 of the handle unit 88, and the jaw 92 is opened and closed by opening and closing the pair of handles 91. A hand switch 49 is disposed on the handle 91 on the distal end side. The distal end portion of the vibrator unit 87 is detachably connected to the proximal end side of the main body portion 89 of the handle unit 88. Here, the vibrator unit 87 has the same configuration as the handpiece 21 of the above-described embodiment. However, in this modified example, the hand switch unit 49 is disposed not in the vibrator unit 87 but in the handle unit 88, and the handle unit 88 and the vibrator unit 87 are connected by an appropriate electrical connection mechanism. The unit 49 is connected to the apparatus main body. In addition, a cam pin similar to that of the above-described embodiment is disposed at the distal end portion of the vibrator unit 87, and a cam frame is disposed in the main body portion 89 of the handle unit 88. Then, by connecting the vibrator unit 87 to the handle unit 88 by the cam mechanism, the proximal end portion of the probe 61 and the distal end portion of the horn 31 are pressed and connected to each other within the main body portion 89 of the handle unit 88. It is like that.

  21 ... 1st unit (handpiece), 22 ... 2nd unit (sheath unit), 31 ... 1st vibration transmission member (horn), 39 ... 1st holding member (inner housing), 54 ... 2nd Holding member (sheath assembly), 61 ... second vibration transmission member (probe), 63 ... narrow outer diameter part, 64 ... taper part, 65 ... pressing part, 66 ... thick outer diameter part, 67 ... elastic member, 69, 74 ... adjustment coupling mechanism (cam mechanism), 69 ... operation part (cam pin), 74 ... operation receiving part (cam surface), 78 ... notification mechanism (concave / convex shape, connection convex surface), 80 ... connection position (engagement concave surface) ).

Claims (9)

A first unit having a first vibration transmission member that extends in the axial direction and transmits ultrasonic vibrations, and a first holding member that holds the first vibration transmission member;
A second vibration transmission member having an end portion extending in the axial direction and transmitting ultrasonic vibrations, and a second vibration transmission member holding the second vibration transmission member movably in the axial direction of the second vibration transmission member. Holding member, and between the second vibration transmitting member and the second holding member, the second vibration transmitting member and the second in the axial direction of the second vibration transmitting member. A second unit having an elastic member that is deformed according to a relative arrangement with the holding member, and applies an elastic force in an axial direction of the second vibration transmission member to the second vibration transmission member;
The first unit and the second unit are connected to each other, and the first vibration transmission member and the second vibration transmission member are arranged coaxially and an end portion of the first vibration transmission member And the end portion of the second vibration transmitting member are brought into contact with each other, and the relative arrangement of the first holding member and the second holding member in the coaxial direction is adjusted to be constant. An adjustment coupling mechanism for adjusting the amount of deformation of the elastic member to a constant;
A surgical treatment apparatus comprising: The adjustment coupling mechanism has a cam mechanism,
The cam mechanism includes an operating portion provided in one holding member of the first holding member and the second holding member, and the first holding member and the second holding member. An operation receiving portion that is provided on the other holding member and extends in a spiral shape about an axis, and the operation portion is moved along the operation reception portion, and the operation portion is the operation reception portion. The first unit and the second unit are connected to each other when arranged at the connection position of
The surgical treatment apparatus according to claim 1. The adjustment coupling mechanism has a necessary amount of operation force for an operation for relatively moving the first holding member and the second holding member in the coaxial direction against the elastic force of the elastic member. The relative movement amount of the first holding member and the second holding member in the coaxial direction with respect to the operation amount is set to be constant, and the first holding member and the second holding amount in the coaxial direction are set. It is changed according to the relative arrangement with the holding member of
The surgical treatment apparatus according to claim 1. The cam mechanism has a constant rotational operation force amount with respect to a rotational operation for moving the first holding member and the second holding member relative to each other in the coaxial direction against the elastic force of the elastic member. The pressure angle is changed with respect to the rotation angle so that
The surgical treatment apparatus according to claim 2. The adjustment coupling mechanism has a notification mechanism for notifying that the first unit and the second unit are coupled.
The surgical treatment apparatus according to claim 1. The cam mechanism has a concavo-convex shape projecting and sinking in a direction intersecting the operation receiving portion before the connection position in the operation receiving portion.
The surgical treatment apparatus according to claim 2. The adjustment coupling mechanism is capable of coupling the first unit and the second unit with a plurality of relative rotational arrangements around a coaxial axis.
The surgical treatment apparatus according to claim 1. The cam mechanism has first and second coupling positions arranged at different positions in the circumferential direction.
The surgical treatment apparatus according to claim 2. The second vibration transmission member is formed on a thick outer diameter portion formed on one end side in the axial direction of the second vibration transmission member, and on the other end side in the axial direction of the second vibration transmission member. A thin outer diameter portion having an outer diameter smaller than that of the thick outer diameter portion, and the second vibration transmitting member formed between the thick outer diameter portion and the thin outer diameter portion, from one end side in the axial direction to the other end. A taper portion with an outer diameter decreasing toward the side, and a pressing portion provided in the taper portion or the thin outer diameter portion and projecting in the radial direction,
The elastic member is provided between the pressing portion and the second holding member in the axial direction.
The surgical treatment apparatus according to claim 1.

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